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There is a possibility of getting corrosion under the paint. If there's trapped moisure during the painting process, this can eat away at the aluminum and cause corrosion. I wonder if this is a warranty item? You can usually strip away the paint, sand away the corrosion and repaint it with primer properly. That will usually get rid of the problem.

I have had paint problems on 'dales over the years. They always seem to spread from places where another metal contacts the aluminum frame. When you have 2 metals in near contact and a little salt (sweat) what you have is a battery or instand corrosion.

My experience does not sound quite like yours though.

Also, hosing the bike down after rides with a water bottle seems to help ****** the process by washing off the salt.